Function assert_cross_node_migration 

pub fn assert_cross_node_migration(
    migrated_pages: u64,
    total_pages: u64,
    max_ratio: Option<f64>,
) -> AssertResult

Check cross-node page migration ratio against threshold.

migrated_pages is the delta of /proc/vmstat numa_pages_migrated between pre- and post-workload snapshots. total_pages is the total allocated pages from numa_maps.

Inconsistent inputs (migrated_pages > 0 while total_pages == 0) fail loudly: vmstat saw migrations the workload’s numa_maps did not account for, which is either a measurement gap or an instrumentation bug, and silently coercing the ratio to 0.0 would let the assertion pass on data the operator should not trust.

When both inputs are zero (migrated_pages == 0 && total_pages == 0) the gate records Inconclusive — the denominator is zero and the check has no signal to evaluate; neither Pass (would silently green a workload that produced no NUMA pages) nor Fail (no actual ratio violation observed) is truthful.